Commutator-brush holder



(No Model.)

G. P. GOODRIOH. GOMMUTATOR BRUSH HOLDER.

Patented Jan. 3, 18.93;

UNIT D STrvras PATENT OFFICE.

' onARLnsr. GOODRIOH, OF CHICAGO, ILLINOIS, ASSIGNOR TO JOHN G.

THOMPSON, or MILWAUKEE, WISCONSIN.

COMMUTATOR-BRUSH HOL'DER.

SPECIFICATION forming part of Letters Patent No. 489,185, dated January3, 1893. Application filed December 29, 1891. Serial N0.416,4=95. (NomodeLl To all whom it concern:

Be it known that I, CHARLES F. GOODRIOH,

a citizen of the United States, and a resident of Chicago, in the countyof Cook, and in the State of Illinois, have invented certain new anduseful Improvements in Oommutator- Brush Holders; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof.

My invention has for its object topr'ovide a commutator-brush-holder inwhich a springcontrolled pressure mechanism may be regulated as totension, without detaching the brush holder from the machine of which itforms a part, and to this end, the said invention consists in certainpeculiarities of construction and arrangementof parts to be hereinafterdescribed with reference to the accom panying drawings and subsequentlyclaimed.

In the drawings':.Figure 1. represents a side elevation'of acommutatorbrush-holder constructed according to myinvention, a faceplateor washer forming part of itsattaching mechanism being shown in section,Fig. 2. a'

Vertical longitudinal section of the same taken online 2-2 of thesucceeding figure, Fig. 3. a plan viewof the brush-holder, the shank ofthe-same being shown as broken away, Fig. '4. adetail elevation partlyin section on line -4 of the preceding'figure, and Fig. 5. a detailtransverse section taken on line 55 of Fig; 4, a spring-arborillustrated by this view being in elevation.

Referring by letter to the drawings, A represents a guide having thegeneral contour of a commutator brush B that is loosely arrangedtherein, and this guide is provided with verticall'y disposed side slots12 that are preferably of segmental form.

v Extending rearward from the upper end of the-guide A is a housing Gprovided with bearings for a transverse arbor D that is squared or,otherwise'sha'pedatits ends to 'takea key or wrench. The guide A andhousmg Care shown as cast, in one piece with a squared shank E forengagement'with a suit able suppo1't,-a' face-plate 0r washer F, andjam-nuts GH being arranged on the screw. threaded-rear endof the shankto serve as a means for holding-the same in rigid engagementwith saidsupport.

said housing.

ber of the same.

is regulated by turning the arbor D in they Surrounding the arbor D,within the housing 0 is a spiral spring I,"th'e coils of the latterbeing wound in opposite directions from a central yoke c that bearsagainst a step d on said arbor, this stop being shown in the form ofascre w,and the ends of the spring have their bearing against the rearWall of Arranged on the arbor D, outside of the housing, are slottedplat-es J, and each of these plates is provided with two lateral studs ediametrically opposite to each other. Slipped onto the arbor D, againstthe plates J, are the rear ends of links K, and these links are providedwith slots f for the engagement with the studs e on said plates. Theforward ends of the links are connected by a transverse pin L, thatengages the slots 6 in the sides of the guide A, andloose onfthis pin isa block M that impinges against the outer end of the commutator brushabove described.

Fast on the arbor D,'outside of the links K, I

are ratchet-plates N, and while I have shown each of these plates asprovided with only three risers, they may have an indefinite num- Thetension of the spring proper-direction, and this tension is maintainedby the engagement of each of the ratchet plates N with a lateral studsonthe relative one of the slotted plates. J above described. The powerof the spring-I, acting throughthe medium of the arbor D,.links K,

pin L and block'M, is exerted on the brush B,

and thus the latter is always held down against the commutator, theslots 6 in the guide A permitting the necessary movement of thespring-controlled mechanism to compensate ior wear on said brush. IShould the springl weaken or it be necessary from any cause to increase,or diminish, its tension the arbor D is turned in the proper directionby means of a key, wrench, or other suitable implement, to accomplishthis result.

The links K being slotted for engagement with the studse on the slottedplates J,'the latter will automatically, adjust themselves to permitthose of their lugs in engagementwith the ratchet-plates N-to.automatically-discus gage and re-engage when'the arbor D is turned totighten the spring I, but if said arbor be turned to loosen said spring,the disengagement of said studs and ratchet-plates, neces sary to permitthis latter turn, can be readily eifecte'd by the operator.

I Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:-

1. A commutator-brush-holder comprising a slotted guide for the brush, apin arranged to engage the slots in the brush-guide, a block 'onthe pinin opposition to said brush, a housing extended from said brush-guide,an arbor having its hearings in thehousing, links connectingthe arborand block-supporting pin, a spiral tension spring wound on the arbor andmade fast thereto, and a ratchet-mechanism controlling the wind of thespring, substantially as described.

2. A commutator-brush-holder comprising a guide for the brush, a housingextending from the brush-guide, an arbor having its hearings in thehousing, a spiral tensionspring wound on the arbor and-rnade'fastthereto, slotted plates arranged on the arbor studs, and apressure-block supported by the links in opposition to said brush,substantially as described.

3. A commutator-brush-holder comprising a guide for the brush cast inone piece with a housing and attaching shank, a spring-controlledpressure-mechanism in opposition tothe brush, and suitable means forregulatingthe tension of said pressure-mechanism, sub-:

stantially as described. 7 d

In testimony thatlclaim the foregoing I have hereunto set'iny hand, atChicago, in the county of Cook and State of Illinois, in the presence oftwo witnesses.

4, CHARLES F. GOODRIOH.

'Witne'sses:

- H. R. LEYDEN,

F. A. BRYAN.

